48*1.08+1.2*56.8
=12*4*1.08+1.2*56.8*10/10
=12*(4*1.08)+(1.2*10)*(56.8/10)
=12*4.32+12*5.68
=12*(4.32+5.68)
=12*10
=120
或者
48*1.08+1.2*56.8
=(1.2*40)*1.08+1.2*56.8
=1.2*(40*1.08)+1.2*56.8
=1.2*43.2+1.2×56.8
=1.2*(43.2+56.8)
=1.2*100
=120
48*1.08+1.2*56.8
=1.2×40×1.08+1.2×56.8
=1.2×43.2+1.2×56.8
=1.2×(43.2+56.8)
=1.2×100
=120